Spin extrusion

Spin extrusion is an incremental, rotational compressive forming process for manufacturing hollow parts out of solid cylinders. This process has been developed in collaborative research of Fraunhofer IWU and Technische Universität Chemnitz. It is a bulk metal forming process combining the principles of backwards cup extrusion and flow forming. Depending on the production task and the material, forming can be conducted as cold, warm or hot forming.

  • Spin extrusion machine BDM 2000
  • Manufacturing of hollow shafts by spin extrusion
  • Scalable electric drive for commercial vehicles

  • Compared to deep hole drilling, considerably higher material exploitation (approx. 90 percent) combined with reduced material input
  • Attractive for processing expensive materials
  • Alternative to impact extrusion in manufacturing of thick-walled hollow parts or hollow parts with steps (diameter-wall thickness ratio D:s < 5)
  • No chemical pre-treatment of the surface required
  • Elaborate dies are dispensable due to kinematic shaping
  • High flexibility allows economic manufacturing of small batch sizes

Development of process chains

  • Market analysis
  • Investigation of process chains
  • Process optimization
  • Cost-benefit calculation
  • Development of manufacturing concepts
  • Planning and technological dimensioning of processes, tools and machines

Development and evaluation of forming strategies

  • Market analysis
  • Feasibility studies
  • Technology development
  • Development of characteristic process values and optimal forming strategies
  • Benchmarking
  • Numerical simulation
  • Manufacturing of prototypes

Quality assurance

  • 3D coordinate measurement
  • Microstructure analyses
  • Determination of mechanical characteristic values

Machine technology

  • Experimental system: spin extrusion machine BDM2000